The Ratio Test states that for a series $$ \sum_{n=1}^{\infty} a_n $$, if $$ L = \lim_{n \to \infty} \left| \frac{a_{n+1}}{a_n} \right| < 1 $$, then the series converges. If $$ L > 1 $$, the series diverges. If $$ L = 1 $$, the test is inconclusive.
Step 2:
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